package com.zhoukx.strategy;

public abstract class Duck {

    public Duck() {
    }

    // 显示鸭子
    public abstract void display();

    public void quack() {
        System.out.println("鸭子嘎嘎叫......");
    }

    public void swim() {
        System.out.println("鸭子会游泳.......");
    }

    public void fly() {
        System.out.println("鸭子会飞.......");
    }
}
